Chicago O'Hare International Airport (ORD)

Chicago O'Hare International Airport (IATA: ORD, ICAO: KORD) is one of the world's largest and most historically significant aviation hubs, anchoring North America's busiest airspace and serving as a primary gateway between the United States, Europe, Asia, and the Americas for over six decades. Last researched and updated: June 2025.

At a Glance

1. Introduction and Role

Chicago O'Hare International Airport is a cornerstone of global aviation. Situated approximately 17 miles (27 km) northwest of downtown Chicago, it routinely ranks among the top five busiest airports in the world by passenger traffic and aircraft movements. O'Hare functions simultaneously as a major domestic hub, an international gateway, and one of North America's most critical cargo facilities. Its geographic position at the center of the continental United States makes it the dominant connecting point between the East and West coasts and between North America and transatlantic or transpacific destinations.

The airport is co-owned and operated by the City of Chicago through the Chicago Department of Aviation (CDA). United Airlines and American Airlines each maintain primary hub operations at O'Hare, making it one of only a handful of airports in the world that serves as a full hub for two major network carriers simultaneously. The airport also supports a substantial cargo operation anchored by freight forwarders, integrators including FedEx and UPS, and international freighter operators.

O'Hare is currently undergoing its most extensive capital transformation since its construction, through the O'Hare 21 modernization program — a multi-billion-dollar initiative to replace aging terminals, add international capacity, and reshape the airfield geometry to reduce delay-producing runway conflicts.

2. History and Naming

3. Location and Geography

O'Hare is located in the northwestern portion of Chicago, with portions of the airport grounds also extending into the village of Rosemont and unincorporated Cook County, though the facility is legally within Chicago city limits. The airport lies approximately 17 miles (27 km) from the Chicago Loop (downtown) and approximately 14 miles (23 km) from the near-north neighborhoods. O'Hare is bordered by Interstate 190 to the south, Interstate 294 (the Tri-State Tollway) to the west, and a network of local roads including Mannheim Road and Higgins Road.

The airport campus covers approximately 7,700 acres (3,116 hectares), making it one of the largest airport footprints in the United States. The central terminal area, airfield, cargo ramps, fuel farm, and ground transportation facilities are all contained within this perimeter. Proximity to I-90/I-94 (the Kennedy Expressway) provides direct highway access toward downtown Chicago.

4. Terminals and Concourses

Terminal 1 (United Airlines)

Terminal 1 is the primary hub for United Airlines and serves as the most architecturally celebrated building at O'Hare. Designed by Helmut Jahn and opened in 1987–1988, it comprises Concourse B (United's domestic concourse) and Concourse C (United's international and domestic concourse), connected by an underground pedestrian walkway featuring Michael Hayden's neon light sculpture "Sky's the Limit." As of 2024, Terminal 1 hosts approximately 50 gates and provides United's full suite of premium lounges. Terminal 1 has undergone phased upgrades to its concessions, gate areas, and gate technology as part of O'Hare 21.

Terminal 2

Terminal 2 historically served as a shared terminal for smaller network and regional carriers. It connects to Terminal 3 airside and hosts gates used by some United Express and American Eagle regional partners. Terminal 2 is slated for eventual demolition or repurposing as part of the O'Hare 21 Global Terminal project, which will consolidate international processing and some domestic capacity.

Terminal 3 (American Airlines)

Terminal 3 is American Airlines' hub at O'Hare, encompassing Concourses G, H, J, and K with a total of approximately 70–75 gates as of 2024. Concourse H connects to the ATS (Airport Transit System) people mover that links all domestic terminals. American's flagship Admirals Club lounges are located in Terminal 3. The concourses support American's extensive domestic and international routes, including transatlantic and Latin American services.

Terminal 5 (International Terminal)

Terminal 5 is O'Hare's dedicated international concourse, housing non-U.S. and some U.S. carriers operating international departures and all international arrivals requiring U.S. Customs and Border Protection (CBP) processing. Terminal 5 was opened in 1993 and has been periodically upgraded. It connects to domestic terminals via the ATS people mover and features a U.S. Customs hall, international baggage claim, duty-free retail, and a range of airline lounges. As of 2024, Terminal 5 hosts approximately 17–18 gates.

Airport Transit System (ATS)

The ATS is O'Hare's automated people mover, connecting Terminals 1, 2, 3, and 5 as well as the remote parking facilities. It operates continuously and provides airside inter-terminal connections, enabling same-day connections between domestic and international flights without exiting security.

5. Airlines Serving the Airport

Note: Airline terminal assignments and route activity change seasonally. Travelers should confirm current terminal and gate information with their carrier or the CDA prior to travel.

6. Airline Hubs and Bases

United Airlines treats O'Hare as one of its two largest hubs (alongside Houston George Bush Intercontinental). United's presence at O'Hare supports transcontinental routes across all major U.S. cities, transatlantic routes to Europe, and transpacific routes to Asia and Australia, as well as extensive domestic connecting traffic through the Star Alliance network. United is the airport's single largest carrier by seat capacity and gate count.

American Airlines operates O'Hare as one of its core hubs alongside Dallas/Fort Worth, Charlotte, Miami, Philadelphia, and Phoenix. American's O'Hare hub provides critical midwest coverage and supports international routes to Europe and Latin America under the Oneworld alliance. American's hub at O'Hare is strategically important because of Chicago's large origin-and-destination (O&D) passenger market and its connectivity to business travel demand from the Midwest.

7. Destinations and Major Routes

O'Hare serves non-stop destinations across North America, Europe, Asia, the Middle East, and Latin America. Domestic routes dominate by frequency, with New York (JFK, LGA, EWR), Los Angeles (LAX), San Francisco (SFO), Boston (BOS), Washington D.C. (DCA, IAD), and Atlanta (ATL) among the highest-frequency corridors. International non-stop destinations include London (LHR), Frankfurt (FRA), Paris (CDG), Dublin (DUB), Tokyo (NRT, HND), Osaka (KIX), Beijing (PEK), Seoul (ICN), Doha (DOH), Istanbul (IST), Toronto (YYZ), Mexico City (MEX), and numerous others.

O'Hare is one of a small number of U.S. airports from which travelers can reach all six inhabited continents on non-stop or one-stop services within a single day, underscoring its role as a true global hub.

8. Passenger Traffic

Note: Figures are approximate and sourced from publicly reported CDA and FAA data. Exact annual figures should be verified against official CDA publications.

9. Aircraft Movements and Cargo Operations

O'Hare consistently records approximately 850,000 to 920,000 total aircraft movements per year in the post-pandemic recovery period (2022–2023), making it one of the highest-movement airports in the United States. Cargo operations are substantial: O'Hare ranks among the top five cargo airports in North America. Major cargo operators include FedEx, UPS, Atlas Air, Cargolux, and Korean Air Cargo. The cargo terminal area is located on the airport's west side and handles approximately 1.7 million metric tons annually (2023 estimate). The ongoing runway reconfiguration projects under OMP and O'Hare 21 are designed specifically to reduce the taxi times and intersection conflicts that previously made O'Hare the most delay-prone major airport in the United States.

10. Runways

Note: Runway dimensions and ILS categories as reported in FAA Airport/Facility Directory data. Travelers and operators should verify current NOTAMs and ILS status with FAA and Chicago ATCT.

11. Capacity and Air Traffic Control

O'Hare is served by the Chicago O'Hare ATCT (Airport Traffic Control Tower), one of the FAA's most complex tower facilities in the United States. The airport also coordinates with Chicago TRACON (Terminal Radar Approach Control), which manages the extremely dense airspace over the Chicago metropolitan area encompassing both O'Hare and Midway airports. At peak periods, O'Hare can handle over 120 aircraft movements per hour. The completion of the OMP runway reconfiguration has increased simultaneous runway utilization and significantly reduced the historically high rate of ground-stop and delay-program activations.

12. Expansion and Development Projects

O'Hare Modernization Program (OMP) — Completed

The OMP, initiated in 2005 and substantially completed by 2013, involved the realignment of O'Hare's runways from an intersecting configuration into a parallel-runway system. This eliminated the primary source of weather-induced delay cascades that had long made O'Hare the most delayed major airport in the U.S. Total program cost exceeded $3 billion.

O'Hare 21 — In Progress (as of 2025)

Announced in 2018 by Mayor Rahm Emanuel and continued under subsequent administrations, O'Hare 21 is an approximately $8.5 billion capital program encompassing:

• Global Terminal (Terminal 4 / T4): A new international-capable terminal planned to replace Terminal 2, consolidate international processing, and add significant gate capacity. Active construction underway as of 2025; targeted for phased opening in the late 2020s.
• Terminal 1 Expansion (United Airlines): New Concourse A to replace aging facilities and add gates for widebody international aircraft.
• Terminal 3 Upgrades (American Airlines): Gate, lounge, and concession renovations.
• Terminal 5 Expansion: Additional gates and processing capacity for international arrivals.
• Ground Transportation Center: A consolidated rental car and ground transit facility.
• ATS Expansion: Extension and modernization of the people mover to serve new terminal footprints.

Project timelines, costs, and scope details are subject to revision. Travelers and stakeholders should refer to the Chicago Department of Aviation's official publications for current status.

13. Ground Transportation

Chicago Transit Authority (CTA) Blue Line: O'Hare is the western terminus of the CTA Blue Line (O'Hare Branch), offering direct rail service to downtown Chicago (the Loop) in approximately 45 minutes. The Blue Line operates 24 hours a day, 7 days a week, making O'Hare one of a small number of major U.S. airports with true 24-hour rail access to the city center. Trains depart every 6–12 minutes during peak periods. The station is located beneath the terminal complex, accessible from T1, T2, and T3 via the ATS or internal walkways.

Taxi and Rideshare: Taxis operate from designated zones on the lower level (arrivals) of each terminal. TNCs (Transportation Network Companies) including Uber and Lyft have designated pickup zones that have been relocated and formalized as part of ongoing terminal construction. Travel time to downtown Chicago by taxi or rideshare ranges from 25 to 60+ minutes depending on time of day and traffic conditions on the Kennedy Expressway (I-90/I-94).

Highway Access: Interstate 190 connects directly to the terminal complex. I-190 meets I-294 (Tri-State Tollway) to the west and I-90 to the east (Kennedy Expressway toward downtown). Kiss-and-ride, cell phone lots, and express pickup lanes are available.

Suburban Bus and Shuttle: Pace suburban bus services and hotel/parking shuttles operate from designated ground level areas. Coach USA and other motorcoach operators provide scheduled service to suburban communities.

Rental Cars: All major rental car companies operate at O'Hare. During O'Hare 21 construction, rental car facilities are being consolidated into a new on-airport Ground Transportation Center; some operations may use shuttle buses to off-airport facilities during construction phases.

14. Parking

O'Hare offers a large parking system encompassing short-term parking garages adjacent to each terminal, economy parking (remote lots served by shuttle buses), and express parking options. Daily rates vary by facility and are subject to change; the CDA and the airport's official parking vendor publish current rates. The on-airport parking infrastructure is also being reconfigured as part of O'Hare 21.

15. Airport Hotels

The Hilton Chicago O'Hare Airport is the only on-site hotel connected directly to the terminal complex (Terminal 2 area), accessible via an enclosed walkway without requiring outdoor transit. Numerous additional full-service and limited-service hotels are located within 1–3 miles of the airport along Mannheim Road and in Rosemont and Schiller Park, served by complimentary hotel shuttles. Properties in the immediate vicinity include Marriott, Hyatt, Westin, Loews, Aloft, and several independent operators.

16. Lounges

17. Dining, Shopping and Passenger Facilities

O'Hare offers an extensive concessions program across all terminals, managed by a combination of national operators (HMSHost, Paradies Lagardère, OTG) and local Chicago restaurateurs. Notable dining concepts include locations from local Chicago institutions such as Tortas Frontera by Rick Bayless, as well as national brands including Wicker Park Seafood and Sushi, and a wide range of quick-service and sit-down options. Retail offerings include Hudson News, duty-free (in T5), electronics, apparel, and Chicago-themed gift shops. All terminals include family restrooms, nursing rooms, interfaith chapels, pet relief areas (landside and some airside), and passenger charging stations throughout gate areas.

18. Accessibility and Family and Pet Travel

O'Hare is ADA-compliant across all terminals and concourses. Wheelchair assistance is available by request through individual airlines. The airport features accessible restrooms, Braille signage, and audio announcements. Family restrooms and nursing suites are available in all terminals. Service animal relief areas are located both before and after security screening. Pet relief areas are designated for travelers with animals; live animal check-in and transport policies are governed by individual airlines.

19. Immigration, Customs and Security

O'Hare is a designated U.S. Customs and Border Protection (CBP) port of entry. All international arriving passengers clear CBP in Terminal 5. O'Hare is a participant in CBP's Automated Passport Control (APC) and Mobile Passport Control (MPC) programs, as well as the Global Entry enrollment and kiosk program. TSA PreCheck is available at all security checkpoints; CLEAR biometric identity verification lanes are available at select checkpoints. Travelers should consult current TSA and CBP guidance for entry requirements, prohibited items, and security procedures, as these are subject to change by regulation.

20. Baggage Services

Baggage claim is located on the arrivals (lower) level of each terminal. Baggage storage services are available through third-party operators; travelers should confirm current availability with airport concessions. Checked baggage policies, fees, and oversized baggage handling are determined by individual airlines. Lost and delayed baggage claims are handled through individual airline baggage offices.

21. Weather and Operational Impact

Chicago's continental climate creates significant operational challenges for O'Hare. Winter weather — including heavy snow, ice, freezing rain, and low-visibility fog — is the primary cause of ground stops, departure delays, and ground delay programs (GDP). O'Hare typically ranks among the top airports nationally for weather-related delays from November through March. The FAA's Air Traffic Control System Command Center (ATCSCC) regularly issues Ground Delay Programs affecting O'Hare, with downstream effects felt system-wide given its connecting role. Thunderstorm activity in summer months can also cause significant delays. The OMP runway reconfiguration has reduced delay severity, but weather-related disruptions remain an inherent feature of operating in Chicago's climate.

22. Environment and Sustainability

The Chicago Department of Aviation has established sustainability goals for O'Hare including targets for carbon emissions reduction, energy efficiency, and waste diversion. The airport has pursued LEED-equivalent standards for new construction components under O'Hare 21, including the Global Terminal. On-site renewable energy installations, LED terminal lighting upgrades, and electric ground service equipment programs have been announced or are in various stages of implementation. CDA has published formal sustainability reports; travelers and researchers should consult these documents for current targets and verified progress metrics.

23. Economic Impact and Employment

O'Hare is one of the largest economic engines in the State of Illinois. Studies cited by the CDA have estimated that the airport generates tens of billions of dollars in annual regional economic activity, directly and indirectly supports hundreds of thousands of jobs in the Chicago metropolitan area, and is responsible for a significant share of Illinois's international trade flows by value (given cargo volumes). The airport directly employs thousands of workers including air traffic controllers, TSA officers, airline and ground handler employees, concession staff, and CDA personnel. Precise current figures should be referenced from CDA's most recent economic impact study.

24. Management, Ownership and Financials

O'Hare is owned by the City of Chicago and operated by the Chicago Department of Aviation (CDA) under the Mayor's office. The CDA also operates Chicago Midway International Airport (MDW). Airport revenues are primarily generated through airline landing fees, terminal rents, concession revenues, and parking fees. O'Hare is financed in part through Airport Revenue Bonds, federal FAA Airport Improvement Program (AIP) grants, and Passenger Facility Charges (PFCs). The O'Hare 21 program is financed through a combination of revenue bonds, PFCs, and airline agreements. United Airlines and American Airlines are both signatory airlines with long-term use-and-lease agreements governing their hub operations.

25. Safety and Security History

O'Hare has experienced several significant aviation accidents over its history:

• May 25, 1979: American Airlines Flight 191, a McDonnell Douglas DC-10, suffered a catastrophic engine separation during takeoff roll. The aircraft lost control and crashed shortly after liftoff, killing all 271 persons aboard and 2 on the ground — the deadliest aviation accident on U.S. soil at the time. The NTSB determined the cause was the improper maintenance procedure used during engine pylon servicing, which led to a fatigue crack and in-flight separation of the left engine, disabling the leading-edge slat system asymmetrically. Following the accident, the FAA temporarily grounded all U.S.-operated DC-10s.
• December 20, 1972: United Airlines Flight 553 crashed near Midway Airport (not O'Hare) — included here for disambiguation only; this event is not associated with O'Hare.

All safety events are referenced as reported in official NTSB investigation findings. Readers requiring full investigation detail should consult the relevant NTSB accident report.

26. Major Disruptions

Beyond weather-related delays (see Section 21), O'Hare has experienced notable operational disruptions including: the FAA-ordered temporary grounding of DC-10 aircraft following Flight 191 (1979), which disrupted summer air travel nationally; significant ground stop events during major winter storms including the Chicago blizzard of 2011; and system-wide disruption in 2020–2021 due to the COVID-19 pandemic, which caused passenger volumes to fall by nearly 80% year-over-year in 2020. A 2014 fire at the FAA's Aurora Air Route Traffic Control Center (ARTCC), which controls high-altitude airspace over the Chicago region, caused a multi-day nationwide disruption affecting thousands of O'Hare and Midway flights.

27. Rankings and Records

28. Architecture, Art and Culture

Terminal 1, designed by Helmut Jahn and opened in 1987–1988, is widely regarded as one of the finest examples of late-modernist airport architecture in the United States. Its soaring steel-and-glass atrium, barrel-vaulted roof, and integration of natural light set a benchmark for airport design of its era. The underground pedestrian walkway connecting Concourses B and C features "Sky's the Limit," a 744-foot neon and fiber-optic light sculpture by Chicago artist Michael Hayden, accompanied by a musical composition — widely considered one of the most iconic public art installations in any airport worldwide. O'Hare's broader concourse areas include rotating art exhibitions curated by the Chicago Department of Cultural Affairs and Special Events (DCASE), reflecting Chicago's deep civic commitment to public art.

29. Connecting at the Airport and Traveler Tips

O'Hare's size and complexity make connection planning critical. Minimum connection times (MCTs) as published by airlines are typically 45–60 minutes for domestic-to-domestic connections and 90–120 minutes for international-to-domestic connections, though travelers unfamiliar with the airport are advised to allow considerably more time, particularly when connections require ATS transit between terminals or CBP processing. Terminal 1 (United) and Terminal 3 (American) are airside-connected within their own concourse systems but not to each other or to Terminal 5 without using the ATS. Terminal 5 is connected to the domestic terminals only via the ATS people mover.

During active O'Hare 21 construction (ongoing as of 2025), signage, gate assignments, and some walkways may be temporarily altered. Travelers should check gate assignments on day of travel rather than relying solely on pre-departure information.

30. Nearby Cities and Attractions

O'Hare's location makes it convenient for access to the entire Chicago metropolitan region as well as northwestern suburban communities. Downtown Chicago (the Loop, Magnificent Mile, Navy Pier, Millennium Park, Museum Campus) is approximately 30–45 minutes by CTA Blue Line. Rosemont, immediately adjacent to the airport, offers hotels, restaurants, the Allstate Arena, and the Donald E. Stephens Convention Center. Northwestern suburbs including Schaumburg, Itasca, Elk Grove Village, and Wood Dale are within 15–20 minutes by road and contain significant corporate campuses and leisure destinations.

31. Comparable Airports

Passenger figures are estimates based on publicly reported 2023 data and should be verified against official airport authority statistics for precision.

32. Current Developments and Future Outlook

The O'Hare 21 program represents the most transformative investment in O'Hare's infrastructure since its original terminal construction. The centerpiece Global Terminal (T4), once complete, is intended to position O'Hare as a world-class international gateway capable of competing with the newest generation of global hub airports. Terminal and concourse expansions for both United and American are intended to increase gate capacity, accommodate larger widebody aircraft (including the Boeing 777X and Airbus A350 family), and improve passenger flow and connection efficiency.

From a traffic standpoint, O'Hare is expected to exceed its pre-pandemic record of 84.6 million passengers (2019) in the mid-2020s as international travel continues recovering and new routes are added. The airport's dual-hub status and geographic position ensure its continued importance to the North American aviation network regardless of broader industry shifts. Environmental pressures, sustainable aviation fuel (SAF) adoption, and electric ground vehicle transition are expected to feature prominently in CDA's planning documents through 2030 and beyond.

33. Frequently Asked Questions

What does ORD stand for?

ORD derives from the airport's original name, Orchard Place Airport / Douglas Field, the World War II-era manufacturing and military airfield on which O'Hare was built. When commercial service began and the airport was renamed O'Hare, the IATA code ORD was retained rather than reassigned.

Who is O'Hare Airport named after?

The airport is named in honor of Navy Lieutenant Commander Edward Henry "Butch" O'Hare (1914–1943), a Chicago native and the U.S. Navy's first flying ace of World War II. He was posthumously awarded the Medal of Honor after shooting down five Japanese aircraft in a single engagement in February 1942. He was killed in action in November 1943.

Which terminal should I use at O'Hare?

Terminal assignment depends on your airline: United Airlines and United Express operate from Terminal 1; American Airlines and American Eagle operate from Terminal 3; most international carriers (non-U.S.) use Terminal 5; Terminal 2 handles some regional and overflow operations. Always confirm your terminal on your boarding pass or with your airline on the day of travel, especially during the O'Hare 21 construction period.

Is there a direct train from O'Hare to downtown Chicago?

Yes. The CTA Blue Line (O'Hare Branch) provides direct service from O'Hare to the Loop (downtown Chicago) in approximately 45 minutes. The train operates 24 hours a day, 7 days a week. The station is located beneath the terminal complex and is accessible from T1 and T3 via internal walkways and the ATS people mover.

Can I connect between terminals without leaving security?

Travelers can connect airside within Terminal 1 (between Concourses B and C) and within Terminal 3 (among Concourses G, H, J, K). The ATS people mover connects all terminals airside, allowing connections between T1, T2, T3, and T5 without clearing security again — but travelers must remain in the secure zone. Connections from Terminal 5 (international arrivals) to domestic departure terminals require clearing CBP first, then re-entering security.

How early should I arrive at O'Hare?

The CDA and airlines generally recommend arriving at least 2 hours before domestic departures and 3 hours before international departures. During peak holiday travel periods, major construction phases, or weather events, additional buffer time is advisable. TSA PreCheck and CLEAR lines typically move faster than standard security lanes.

Is Global Entry available at O'Hare?

Yes. Global Entry kiosks are available in the Terminal 5 arrivals hall. Enrollment interviews for Global Entry are conducted at the CBP office at O'Hare; appointments are required and are made through the CBP Trusted Traveler Programs (TTP) website.

What is O'Hare 21?

O'Hare 21 is an approximately $8.5 billion capital improvement and modernization program announced in 2018 by the City of Chicago. It encompasses a new Global Terminal (T4), expansions of Terminals 1 and 3, upgrades to Terminal 5, a new Ground Transportation Center, and ATS expansion. The program is intended to bring O'Hare's infrastructure to contemporary standards for a major international hub airport and increase gate and passenger capacity significantly.

How is O'Hare different from Chicago Midway?

O'Hare is Chicago's primary international airport, offering significantly more gates, destinations, airlines, and cargo facilities. Midway (MDW), located on Chicago's south side approximately 10 miles from downtown, is the primary base for Southwest Airlines and serves primarily domestic and some near-international routes. O'Hare handles the vast majority of Chicago's international and connecting traffic.

Is there a hotel inside O'Hare Airport?

Yes. The Hilton Chicago O'Hare Airport is connected to the terminal complex (near Terminal 2) via an enclosed walkway and is accessible without outdoor transit. It is the only hotel located on the airport campus itself, though many additional hotels are within a short shuttle ride in the surrounding communities.

Why is O'Hare known for delays?

Historically, O'Hare's runway layout — which featured multiple intersecting runways — caused cascading delays during inclement weather. Chicago's continental climate, with frequent winter storms, fog, and summer thunderstorms, compounds operational complexity. The OMP runway reconfiguration (completed by 2013) significantly reduced weather-related delays by creating parallel runway operations, but Chicago's weather patterns mean weather-related delays remain more common at O'Hare than at airports in more temperate climates.

34. Key Statistics

35. Conclusion

Chicago O'Hare International Airport occupies a singular place in the history and future of global aviation. From its origins as a wartime manufacturing airfield to its decades as the world's busiest airport, through the transformative runway reconfiguration of the 2000s and into the current O'Hare 21 modernization era, ORD has continuously adapted to the demands of an evolving industry while anchoring Chicago's role as North America's interior aviation hub. Its dual-hub status, unmatched network connectivity, and ongoing infrastructure investment position it to remain among the world's foremost airports well into the twenty-first century. For travelers, planners, airlines, and aviation historians alike, O'Hare is not simply a destination or waypoint — it is a defining institution of American and global air travel.

36. Official Resources

• Chicago Department of Aviation (CDA) — O'Hare: https://www.flychicago.com/ohare
• FAA Airport Information (ORD): https://www.faa.gov (search: ORD airport)
• U.S. Customs and Border Protection — O'Hare Port of Entry: https://www.cbp.gov
• CTA Blue Line Information: https://www.transitchicago.com
• TSA — Airport Security Information: https://www.tsa.gov